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21.1. Male = testosterone
Female = progesterone
2. Pituitary defeciency (hypopituitarism) ultimately causes a defeciency of hormones produced by the gonads, adrenal cortex and thyroid gland, as well as loss of growth hormone. Lack of anti-diuretic hormone produced by the hypothalamus causes diabetes insipidus
22. Growth hormone, which regulates growth, metabolism and body composition. Luteinising hormone and follicle stimulating hormone, also known as gonadotrophins. They act on ovaries or testes to stimulate sex hormone production, and eggs and sperm maturity,prolactin, which stimulates milk production
23. Auxins are important category of plant hormones. They play an important role in stem elongation and all kinds of growth and development activities. They also play an important role in embryo development and reaction to external stimulus
24. Bile juice emulsifies the large globules of fat into smaller globules and it also makes acidified food into slightly alkaline or basic in nature
25. Enzymes are like catalyst, it makes the digestion of food faster and enzymes released during digestion are amylase,lipase,pepsin and trypsin. Amylase acts on carbohydrates, lipase acts on fats, trypsin and pepsin acts on protein and converts to peptones
26.1. 6CO2 + 12H2O -------- C6H12O6 +6H2O + 6O2. Takes place by light and chlorophyll
26.2. Desert plants take up CO2 at night and perform photosynthesis
27. 1. Combination reaction
2. Double displacement reaction
3. Decomposition reaction ( electrolysis)
4. Decomposition reaction
28. 2KBr + BaI2 --------- 2KI + BaBr2
30.1.Pole = It is the mid-point or centre of mirror
2. Centre of Curvature = It is centre of the sphere for which mirror is a part
3. Principal axis = It is a horizontal line passes through focus, centre of Curvature, pole.
4. Focus = It is the mid-point of centre of curvature and pole (or) A point where the the incident ray intersects the principal axis
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